Check the internet for special prices.
You need to establish an account with a dental supply co.
They usually don't care if you are a business or not
to purchase but require that you set up an account which only takes a few minutes.

Custom Craft Harmonicas 1-702-256-7470
F&R Farrell 1-800-438-3543

F&R Farrell Co. and Custom Craft Harmonicas Ltd. (also see Links, Online Shops and Harmonica Reviews, Custom) also market their brand of rotary tools designed for tuning reeds. I don't know how heavy duty they are to perform outside of tuning reeds so you may want to inquire from them first if you intend to use it for other purposes.

The dental supply companies as well as MicroMark and F&R Farrell Co. sell optical loupes.
Files suited for tuning can also be purchased through F&R Farrell Co.
Sanding Sticks can be puchased at Woodworkers specialy stores and on the internet from MicroMark Inc.